Can someone please help, I have a 2005 Hyundai Tucson (V6 Model, not sure if that matters) I would like to add a speaker in the rear of the vehicle / trunk. How do I connect it to the system? I tried to find instruction online, but seems hopeless as I know nothing about theese matters and dont want to pay a fortune to somone to plug in a single speaker in a small box that was in the trunk of our 2005 Hyundai XG350. I am not sure if it is necessary to connect to the amp that is under the passanger seat or the amp that is in the trunk tire well? Any help from anyone with a clue would be greatley appreciated.....Thank you in advance. Cassandra